Harrison Pass
Peak · 12,719 ft · Eastern Sierra corridor
Harrison Pass is a 12719-foot peak in California's Eastern Sierra, sitting above the headwaters of the Owens River drainage. Wind funnels hard through the pass, making it colder and more exposed than lower Sierra crossings.
Wind dominates the day. Morning calm breaks by mid-morning as air rises off the eastern valleys and funnels through the gap. By afternoon, sustained gusts push 15 to 20 mph steady, peaking 30 to 40 mph. Cold air pooling at elevation keeps temperatures 10 to 15 degrees below the valley floors.
Over the last 30 days, Harrison Pass averaged a NoGo Score of 38.0 with temperatures holding at 22 degrees Fahrenheit and average wind of 15 mph; maximum gusts reached 42 mph. The week ahead typically follows this pattern: expect marginal conditions early in the day, deterioration by mid-afternoon. Plan early starts and monitor wind before committing to ridge travel.
30 days back / 7 days forward
Today's score by factor
About Harrison Pass
Harrison Pass sits at 12719 feet in the Eastern Sierra, straddling the Inyo-Mono County line. Access is primarily via Highway 395 from the Mammoth Lakes area or from the east via Big Pine. The pass drains north into the Owens River system and sits directly above pinyon-juniper and sagebrush country. The approach is exposed alpine, with no sheltered water or windbreaks. Typical drive time from Mammoth Lakes is 45 to 60 minutes via Highway 395 north, then high-country backroad or foot. The peak itself is rock and talus, little vegetation above 11000 feet.
Winter and early spring bring avalanche terrain instability. The pass occupies steep gullies and faces where wind-loaded slabs form; check ESAC forecasts before any approach involving snowpack above 10000 feet. Late spring through early autumn see clearer passage, though snow lingers in north-facing chutes into early summer. The 30-day average wind of 15 mph is typical for this elevation and exposure; gusts regularly exceed 42 mph in the afternoon. Temperatures swing from 4 degrees Fahrenheit in winter to 35 degrees in midsummer, but the pass sits cold year-round. Crowding stays minimal (30-day average of 2.0), making this a solitary high-country crossing.
Harrison Pass suits experienced high-country hikers and climbers who understand alpine exposure and wind behavior. Scrambles to the peak from the pass are straightforward but unforgiving in wind; sections of loose talus demand solid footing. Avoid afternoons entirely in spring and early summer; morning-only travel is safer and more pleasant. The pass itself is a through-route for extended Sierra traverses; few linger. Bring layers and expect to shed and add clothing three or four times during a single day. Navigation is reliable in good weather but clouds and wind-driven snow can reduce visibility to near zero even in late spring.
Nearby Tioga Pass (Highway 120) sits roughly 35 to 40 miles north and handles similar traffic patterns but with heavier crowds in summer. Kearsarge Pass and Independence Pass to the south offer alternative alpine crossings at slightly lower elevations. The Eastern Sierra corridor from Mount Whitney to Donner Pass offers a continuous high-altitude experience; Harrison Pass serves as a quiet waypoint on that longer arc. Water sources near the pass are minimal; most approach water from the Owens River drainage below.